F25J 3/04709
As an auxiliary column system in at least a dual pressure main
Official title: {as an auxiliary column system in at least a dual pressure main column system}
F25J3/04709 (As an auxiliary column system in at least a dual pressure main) appears on 94 US grants and 49 published applications in this corpus.
Search patents in F25J- Granted patents
- 94
- Published applications
- 49
- Assignees
- 15
- Inventors
- 94
- Latest grant
- 26 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 0 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 3 | 0 |
| 1987 | 0 | 0 |
| 1988 | 7 | 0 |
| 1989 | 5 | 0 |
| 1990 | 2 | 0 |
| 1991 | 4 | 0 |
| 1992 | 0 | 0 |
| 1993 | 5 | 0 |
| 1994 | 1 | 0 |
| 1995 | 1 | 0 |
| 1996 | 4 | 0 |
| 1997 | 6 | 0 |
| 1998 | 2 | 0 |
| 1999 | 6 | 0 |
| 2000 | 1 | 0 |
| 2001 | 8 | 2 |
| 2002 | 3 | 3 |
| 2003 | 5 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 1 |
| 2011 | 0 | 2 |
| 2012 | 0 | 0 |
| 2013 | 1 | 0 |
| 2014 | 1 | 1 |
| 2015 | 0 | 0 |
| 2016 | 2 | 6 |
| 2017 | 0 | 0 |
| 2018 | 4 | 3 |
| 2019 | 4 | 3 |
| 2020 | 2 | 2 |
| 2021 | 1 | 4 |
| 2022 | 0 | 2 |
| 2023 | 3 | 3 |
| 2024 | 3 | 9 |
| 2025 | 3 | 2 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for separating air by cryogenic distillation26 May 2026US 12,638,239 B2L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Process for cryogenic fractionation of air, air fractionation plant and integrated system composed of at least two air fractionation plants30 Dec 2025US 12,510,294 B2Linde Aktiengesellschaft
- Air separation unit and method for cryogenic separation of air using a distillation column system including an intermediate pressure kettle column8 Jul 2025US 12,352,496 B2Praxair Technology, Inc.
- System and method for cryogenic air separation using four distillation columns including an intermediate pressure column28 Jan 2025US 12,209,802 B2Praxair Technology, Inc.
- Air separation device and air separation method22 Oct 2024US 12,123,647 B2Taiyo Nippon Sanso Corporation
- Method for cryogenic separation of air, and air separation system10 Sep 2026US 2026/0266539 A1Linde Aktiengesellschaft
- Air separation method and air separation device30 Jul 2026US 2026/0218981 A1Taiyo Nippon Sanso Corporation
- System and method for production of ultra-high purity oxygen5 Feb 2026US 2026/0035243 A1
- Air separation unit14 Aug 2025US 2025/0257941 A1L Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude
- Cryogenic air rectification system, control unit, air separation unit and method of cryogenically separating air8 May 2025US 2025/0146746 A1Linde Aktiengesellschaft
Most cited
By later US patents
- Air separation process and apparatus for high argon recovery and moderate pressure nitrogen recovery46US 4,822,395 AUnion Carbide Corporation · 1989
- Cryogenic air separation with cold argon recycle38US 4,533,375 A1985
- Production of ultra-high purity oxygen from cryogenic air separation plants31US 5,049,173 AAir Products and Chemicals, Inc. · 1991
- Air separation with medium pressure enrichment30US 4,433,989 A1984
- Thermal cycle for the compression of a fluid by the expansion of another fluid25US 4,022,030 AL Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation des Procedes Georges Claude · 1977